Macro Pictures by assistantua 2 / 22 Open-pit mine Stock Photos by WDGPhoto 2 / 57 Rubble Rock Wall Picture by emersont 1 / 195 lead crystals background Picture by jonnysek 1 / 89 Natural Placer Gold Nugget Stock Photography by Fireflyphoto 2 / 88 Mining quarry with special equipment, open pit excavation. Macro Stock Photography by assistantua 1 / 8 Natural Placer Gold Nugget Stock Photography by Fireflyphoto 3 / 170 Large Conveyor moves Crushed Ore to Processing Plant Stock Photographs by gwhitton 1 / 95 very Large excavator at work Stock Photo by artphotoclub 1 / 6 Azurite is a soft, deep blue copper mineral Stock Photographs by assistantua 1 / 21 Bingham Kennecott Copper Mine Close-up Stock Image by gwhitton 1 / 253 Layers Open cut mine of mineral deposits Stock Images by roboriginal 1 / 17 Crystal, an abstract beautiful background of structure of a crystal. Russia Stock Photography by Laures 1 / 5 Giant Ore Truck at Bingham Kennecott Copper Mine Pictures by gwhitton 13 / 602 rough Cassiterite (Tin ore) stone on black Stock Photo by vvoennyy 1 / 45 Gold Nugget in Riffles of Gold Pan Stock Photos by Fireflyphoto 4 / 229 Ngwenya Iron Ore Mine Stock Images by demerzel21 1 / 43 Gold treasure Stock Photos by franckito 4 / 53 Vials of Gold Dust and Gold Nuggets Stock Images by Fireflyphoto 2 / 128 Iron ore opencast mining Stock Photo by Dragunov 1 / 11 Bingham Kennecott Copper Mine Stock Images by gwhitton 3 / 142 Gold in Quartz Specimen - Colorado Stock Photographs by Fireflyphoto 5 / 1,037 Cassiterite (Tin ore) stone isolated on white Pictures by vvoennyy 1 / 31 Giant Water Truck Supressing Dust at Copper Mine Stock Image by gwhitton 10 / 723 Natural Gold Nuggets and Dust - California, United States Stock Images by Fireflyphoto 1 / 13 Natural Placer Gold Nugget Stock Photography by Fireflyphoto 2 / 17 Placer Gold Nuggets Stock Image by Fireflyphoto 1 / 256 Crystal, an abstract beautiful background of structure of a crystal. Stock Photography by paulrommer 3 / 1,082 Iron ore mining. The banding might have resulted from seasonal changes in organism activity.Copper Ore Deposit Stock Photographs by fotomine 0 / 618 Gold ore deposits texture Stock Photos by kgtoh 1 / 720 Ore texture Stock Photographs by knorre 2 / 381 Iron cap (gossan) on top of a hill over a metal ore deposit, Cyprus Stock Photos by photomaru 0 / 0 ore conveyor Stock Image by jordache 6 / 192 Mining Equipment Maintenance Shop at Bingham Kennecott Copper Mine Picture by gwhitton 34 / 1,061 High-Grade Gold Ore and California Placer Gold Nuggets Stock Photographs by Fireflyphoto 1 / 233 Close-up of Bingham Kennecott Copper Mine Open Pit Excavation Pictures by gwhitton 26 / 867 Azurite mineral stone. These minerals deposited on the sea floor in great abundance, forming what are now known as the "banded iron formations." The rocks are "banded" because the iron minerals deposited in alternating bands with silica and sometimes shale. This oxygen immediately combined with the abundant dissolved iron to produce hematite or magnetite. The iron ore deposits began forming when the first organisms capable of photosynthesis began releasing oxygen into the waters. At that time Earth's oceans contained abundant dissolved iron and almost no dissolved oxygen.
Nearly all of Earth's major iron ore deposits are in rocks that formed over 1.8 billion years ago.
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Photo taken by André Karwath, GNU Free Documentation License. This photo spans an area of rock about one foot wide. In this specimen bands of hematite (silver) alternate with bands of jasper (red). Banded Iron Formation: Close-up view of a banded iron formation.